{
  "manageEntity": {
    "action": "Save",
    "entityId": "1540149669",
    "entityType": "Track",
    "nonce": "0x2cf5299dc21d013c0b8c2cbac3216432364cc5225eafb6d552371c547f84dbef",
    "signature": "0xebdcd5a5d4e8b65b5325a9bef7ec1863ff9ee617a4824fd49360f7c0ce03f7622a5e27351c7f087d13d9764c8a88225fca858a8448be5989a9ea87ac2b6ba2ff1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}